1. The problem statement, all variables and given/known data A 1200 kg car traveling north at 14 m/s is rear-ended by a 2000 kg truck traveling at 25 m/s. a) What is the total momentum before and after the collision? b)If the car and truck lock bumpers and stick together, what is their speed immediately after the collision? c) If the care and truck do not lock bumpers and the velocity of the car after the collision is 5 m/s, what is the speed of the truck after the collision? 2. Relevant equations 3. The attempt at a solution I'm stuck on the concepts and my teachers hasn't gone into detail in class yet. If someone can explain the concepts then I can probably figure out the math.